John p



J. P. KISLINGBURY.

1 BURGLAR-ALARMS.

l;-\10 178|243,V Y Patented June 6,1876..

l their inner edges.

UNTED STATES PATENT @Frio JOHN P. KrsLINGRURY, OE ROCHESTER, NEw YORK.

IMPROVEMENT IN BURGV'LAR-ALARMS.

Specication forming part of Letters Patent No. 178,243, dated June. 6,1876; application led April e, 1876.

To all whom. fit may concern Be it known that I, JOHN P. KISLINGEURY,ot' the city ofItocllester, in the county of Monroe and State of NewYork, have invented a .certain new and useful Improvement in CombinedDoor-Bolts and Burglar-Alarms; and I do hereby declare that thefollowing is a full, clear, and exact description of the construe tionand operation of the same, reference be ing had to the accompanyingdrawings, in

Figurell is a front elevation of my improvement applied to a door. Fig.2 is a plan of one ofthe double-acting bolts. Fig. 3 is a detail view.

My improvement relates to those alarms which are operated by thedoor-knob.

The invention consists ofdouble-acting bolts, i

is the spindle ot' the ordinary door-knob.

D is the ordinary lock-bolt or latch. E is the alarm-bell, which may beattached to the door in any desired position. The alarm is struck by twohammers, F F, pivoted upon studs a a, and resting inside the bell in anyordinary manner. No other mechanism is required in the bell. i Gr is aplate attached to the door in line with the lock. H H are cases orsockets forming a part of the plate. I I are the double-acting bolts,which run through the cases and shoot into the keepers K K of the jamb.l' l are arms of the bolts. They are pivoted at c c to the ends of thebolts, and are provided with a series ot teeth or cogs, d d, on L is agear, attached fast to rthe knob-spindle, and engaging with the twotoothed arms, as shown in Fig. l. This gear may be toothed all the wayaround, or

only on the two opposite sides, as shown.

It will be seen that, as the knob `is turned, the two bolts I I will bethrown, one forward andthe other back, the action being reciprocal.

M M are two links, having studs or pins at their ends, which rest inlongitudinal slots j' f of the rack-bars Il l. .Their opposite ends meetat an angle, and are secured upon a screwbolt, g. The screw-bolt slidesin a slot, k, Fig. 3, ot' tllecase, and has a shoulder,', on the inside,and va clamping-nut, k, upon the outside. Each ot' the links M has aslot,` l, which rests over a stationary, pin, m.

'When the screw-bolt g is drawn back in the slot h, as shown in fulllines, Fig. 1, the links are depressed, so that the rackLbars I l fallinto engagement with the gear L, and the double-acting bolts I I canthen receive motion from the door-knob; but when the screwbolt is pushedforward, as shown in dotted lines, the rack-bars are then elevated fromengagement with the gear L, 4and the doorknob then runs free. This isowing to the ruiming ot' the links on the fixed pins m m. The linlrs canbe clamped in either position by the nut 7c.

During the night the rack-bars are placed in engagement with thedoor-knob, as above described, in which case the bolts I I arealternately thrown into and out of their keepers by turning the knob inopposite directions. These bolts act in conjunction with the Ordi` 'narylock-bolt, inasmuch as the latter cannot be Withdrawn from 'its keeperbefore one or the other of the double-acting bolts will be thrown intoengagement with the jamb.

The invention above described is designed to afford additional ,securityagainst burglars and tram ps, by employing a device which is positiveand sure in its engagement. The ordinary lock-bolt Vor latch alone isVery insecure. During the day the rack bars are thrown out ofengagement, thereby allowing the door to be opened and closed withouti111-, pediment.

The form of the plate G is such that the bolts 'are made rightV and leftby simply inverting the plate. If desired, the plate may be made in theform Ot' an inclosing-case, like an ordinary lock-case. P is a rock-armor counection extending from the bolt-work np to the alarm. It ispivoted at p to the door, and at the lower end it has a slot, r, whichrests over a pin, s, of the vupper rack-bar. I. the rack-bar is thrownthe rock-arm will be correspondingly rocked. lAt the top are two boxes,t/t,in which restboltsu u, thrown up by coiled springs v n. The upperends of these bolts rest between the tangs w w of the bellhammers. Thetops of the bolts are made inclined downward toward the center, and theends of the tangs w lw are made correspondingly inclined. As therock-arm is rocked in one direction or the other the bolts will strikethe hammers, and spring the same as they pass from under them. On thereturn the spring-bolts will yield 'and pass under the hammers andcenter themselves again.

This device is very simple, and obviates much of the mechanism in commonburglaralarms. It is eifective against burglars and tramps. v,

.I do not claim, broadly, a swinging arm and a spring-boltfor-soun'clingthe alarm.

What I claim as new is- ,1.,The combination, with the gear L anddouble-acting bolts I I, of the pivoted rackbars I I', arranged to beconnected with or disconnected from the said gear, as and for thepurpose specified. Y

2. The combination, with the pivoted rackbars I Il, of the links M M,sliding screw-bolt g, and clamping-nut k, as and for the purposespecified." v

3. In combination with the door-bolts. I I and the two hammers F F, therock-arm P, connected with the door-bolts by a slot and pin, andprovided at its upper end with the springbolt u u, the tops ot' saidspring-bolts being beveled inward to allow them to center between theham mers, as shown and described,

.and for the purpose specied.

v In witness whereof I have hereunto signed my name in the presence oftwo subscribing

